One vertex per element, one color per generator, with an edge from x to x·s.
(2,3)(5,6)(7,11)(8,12)(9,13)(10,14)(15,18)(16,19)(17,20)(21,22)(23,26)(24,27)(25,28)(29,33)(30,34)(31,35)(32,36) involution — undirected(1,2)(3,4)(5,7,10,17)(6,11,14,20)(8,16,9,15)(12,19,13,18)(21,23,25,31)(22,26,28,35)(24,32,33,30)(27,36,29,34)(1,3,4,2)(6,12)(7,15)(8,9)(13,14)(16,17)(18,19)(22,27)(24,33)(26,34)(28,29)(30,32)(35,36)(5,8,10,9)(6,13,14,12)(7,16,17,15)(11,18,20,19)(22,28)(26,35)(27,29)(34,36)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.